Thralls Station RSD Wastewater Treatment Plant, Marion Heights, Indiana

Thralls Station RSD is a municipal wastewater treatment facility located in Marion Heights, Vigo County, Indiana. The plant serves a population of approximately 1,264 residents, classifying it as a small community system within the United States' wastewater infrastructure. The plant employs advanced treatment processes, ensuring high-quality effluent before discharge. With a designed capacity of 757.08 cubic meters per day and a matching discharge volume, the facility operates at full capacity. As a US-based plant, it is subject to the Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting, which sets strict limits on pollutant discharges to protect water quality. The treated effluent is discharged into local waterways that ultimately drain into the Wabash River basin, a major tributary of the Ohio River and Mississippi River system. This watershed supports diverse aquatic life and provides drinking water for downstream communities. The plant's advanced treatment helps minimize nutrient and contaminant loads, contributing to the ecological health of the region.

The plant discharges into the Wabash River watershed, which flows into the Ohio River and then the Mississippi River, eventually reaching the Gulf of Mexico. This basin supports a variety of fish species and provides habitat for migratory birds. Advanced treatment at this plant reduces nutrient pollution, helping to mitigate downstream eutrophication and protect aquatic ecosystems.